Re: Division issue with 3.8.2 on AIX 7.1
On 6/3/20 10:37 PM, Sherry L. West wrote: > I need off this list please. I don’t even have this. Unsubscribe here: https://mail.python.org/mailman/listinfo/python-list -- https://mail.python.org/mailman/listinfo/python-list
Re: Division issue with 3.8.2 on AIX 7.1
On 6/3/2020 8:11 PM, Dennis Lee Bieber wrote: On Tue, 2 Jun 2020 12:26:16 -0500, Albert Chin declaimed the following: I've built Python 3.8.2 on AIX 5.2, 5.3, 6.1, and 7.1. I am seeing different results for the following Python program: $ python3 -c "eps = 2.0 ** -53.0; tiny = 2.0 ** -1022.0; \ print ((1.0 - eps) / tiny * 4.0)" I get the correct result, 1.7976931348623157e+308, on AIX 5.2, 5.3, and 6.1. But, on 7.1, I get "inf". Execute "print(1.0-eps, tiny)" and see if they differ. Anyone know where can I look in the Python source code to investigate this? Have you considered that it might be something in an underlying C library (especially for the double-precision exponentiation)? This is a more likely source of the change than our code. -- Terry Jan Reedy -- https://mail.python.org/mailman/listinfo/python-list
Re: Division issue with 3.8.2 on AIX 7.1
I need off this list please. I don’t even have this. On Wed, Jun 3, 2020 at 11:30 PM Albert Chin < python-l...@mlists.thewrittenword.com> wrote: > On Wed, Jun 03, 2020 at 08:11:17PM -0400, Dennis Lee Bieber wrote: > > On Tue, 2 Jun 2020 12:26:16 -0500, Albert Chin > > declaimed the following: > > > > >I've built Python 3.8.2 on AIX 5.2, 5.3, 6.1, and 7.1. I am seeing > > >different results for the following Python program: > > > $ python3 -c "eps = 2.0 ** -53.0; tiny = 2.0 ** -1022.0; \ > > >print ((1.0 - eps) / tiny * 4.0)" > > > > > >I get the correct result, 1.7976931348623157e+308, on AIX 5.2, 5.3, > > >and 6.1. But, on 7.1, I get "inf". > > > > > >Anyone know where can I look in the Python source code to investigate > > >this? > > > > Have you considered that it might be something in an underlying C > > library (especially for the double-precision exponentiation)? > > On Wed, Jun 03, 2020 at 08:44:47PM -0700, Miki Tebeka wrote: > > > Anyone know where can I look in the Python source code to investigate > > > this? > > > > Probably around > > https://github.com/python/cpython/blob/master/Objects/floatobject.c > > Thanks to both of you. I applied some updated OS patches and the > problem went away. > > -- > albert chin (ch...@thewrittenword.com) > -- > https://mail.python.org/mailman/listinfo/python-list > -- Mrs. Sherry West Owens Cross Roads Elementary -- https://mail.python.org/mailman/listinfo/python-list
Re: Division issue with 3.8.2 on AIX 7.1
On Wed, Jun 03, 2020 at 08:11:17PM -0400, Dennis Lee Bieber wrote: > On Tue, 2 Jun 2020 12:26:16 -0500, Albert Chin > declaimed the following: > > >I've built Python 3.8.2 on AIX 5.2, 5.3, 6.1, and 7.1. I am seeing > >different results for the following Python program: > > $ python3 -c "eps = 2.0 ** -53.0; tiny = 2.0 ** -1022.0; \ > >print ((1.0 - eps) / tiny * 4.0)" > > > >I get the correct result, 1.7976931348623157e+308, on AIX 5.2, 5.3, > >and 6.1. But, on 7.1, I get "inf". > > > >Anyone know where can I look in the Python source code to investigate > >this? > > Have you considered that it might be something in an underlying C > library (especially for the double-precision exponentiation)? On Wed, Jun 03, 2020 at 08:44:47PM -0700, Miki Tebeka wrote: > > Anyone know where can I look in the Python source code to investigate > > this? > > Probably around > https://github.com/python/cpython/blob/master/Objects/floatobject.c Thanks to both of you. I applied some updated OS patches and the problem went away. -- albert chin (ch...@thewrittenword.com) -- https://mail.python.org/mailman/listinfo/python-list
Re: Division issue with 3.8.2 on AIX 7.1
> Anyone know where can I look in the Python source code to investigate > this? Probably around https://github.com/python/cpython/blob/master/Objects/floatobject.c -- https://mail.python.org/mailman/listinfo/python-list
Division issue with 3.8.2 on AIX 7.1
I've built Python 3.8.2 on AIX 5.2, 5.3, 6.1, and 7.1. I am seeing different results for the following Python program: $ python3 -c "eps = 2.0 ** -53.0; tiny = 2.0 ** -1022.0; \ print ((1.0 - eps) / tiny * 4.0)" I get the correct result, 1.7976931348623157e+308, on AIX 5.2, 5.3, and 6.1. But, on 7.1, I get "inf". Anyone know where can I look in the Python source code to investigate this? -- albert chin (ch...@thewrittenword.com) -- https://mail.python.org/mailman/listinfo/python-list
